Yarn-severing mechanism for knitting-machines.



R. w. soon.

YARN SEVERING MECHANISM FOR KNITTING MACHINES. APPLICATION FILED'JANI-G. 1915.

1 374,338. Patented July 30, 1918.

t I "AM J r .1 I; x m lla M-aes-ses, lw:

' ee/ease.

Em g1 WN @FMEE.

, ROBERT w. sco'r'r, or nos'ron, massacnosn'r'rs, assrenon, BY mE'sNE ASSIGNMENTS,

TO SCOTT 5 WILLIAMS, INCORPORATED, A CORPORATION OF MASSACH' SETTS.

Yam-severance mucnamsm roe KNITTING-MACHINES.

Specification of Letters Patent. I Patented July 318), 1918.

Application filed January 6, 1915. Serial No. 756.

closed in the applications of Henry L. Trudel filed March 24, 1910, Serial No. 551,306 [Letters Patent No. 1,191,100, dated July 11, 1916] and of said Trudel and Howard B; Dawson, Serial No. 735,120 filed December 5, 1912 [Letters Patent No. 1,248,206, dated November 27, 1917]. One object of my present invention is to improve the construction and operation of such devices, as

Well as to adapt them to cotipcration in an improved manner with hosiery knitting machines of an improved form; for one instance only, such as of the type disclosed in my applications Serial No. 746,070, filed February 3, 1913 Serial No. 766,401, filed May 8, 1913 arid Serial No. 859,894 filed September 2, 1914 [respectively Letters Patent Nos. 1,152,850, Sept. 7, 1915; 1,148,055, July 27, 1915; 1,178,683, April 11,1916].

In the accompanying drawings:

Figure 1 is a side elevation partly in section illustrating my improved devices ap-- plied to a circular knitting machine;

- Fig. 2 is a plan view of the knitting head of a machine provided with my said devices;

Fig. 3 is a detail section on line 33 of Fig. 2.

The machine of my said applications comprises a rbtary needle cylinder 260, having an attached web-holder bed 295, and automatic knitting devices coiiperating with needles in said cylinder, including a series of yarn-guides F, F, thrust bars 460 for.

operating said yarn-guides, and a pattern surface such as drum 120 for controlling the times of operation of some of said devices. One of the yarn guides F may be operated for sectional splicing by thrust bar 460 laterally moved when permitted by cams on drum 120 by means of lug S and cam 296 rotating with the needle cylinder. Yarn guides F may be made alternately operative in any order at any time for yarn changing, and when rendered idle my said machine provides for guiding, receiving, cutting and clamping the idle yarns by means shown at 604, 606, 608, 611, said means being within the circle of needles at the upper end of cylinder 260.

For actuating a plurality of yarn guides so frequently as to exchange their yarns at the borders of predetermined segments of the fabric, for split tubular or split-foot knitting, the machine may be provided with the device of my said application Serial No. 859,894, comprising rocker levers 732, 733 carried by a stud 703 on lever 701, 702 rocked into and out of position by cams 522 carried by drum 120 to cause said levers to be actuated by rotating cams (not shown) and to move into and out of operative contact with bars 460, thereby to operate the selected number of yarn guides F, F.

Yarns removed from the needles for sectional splicing or for split tubular knitting by these devices have heretofore been floated across the circle of needles, passing above a fabric guard plate 602 and under the closed shears 608, such floats being cut from the completed article by hand.

In order automatically to remove the floated yarns formed by frequently operated yarn-guides operating for either or both of said purposes, or for other purposes, by severing and holding the floated yarn in the manner disclosed in said Trudel and Dawson applications, I provide means constituting a simple device of improved operative qualities for causlng drum 120 to cont-r01 the position and operation of the cutter and clamp mechanism.

The established stud 554 upon which the yarn guides F of said machine are pivoted is extended toward the observer in Fig. 1 to provide a bearingoutside the yoke of the latch ring or needle guard member 550 for in an adjustable Wear plate 123 taking under.

a positioning lever 105' extending over the latch ring 550, to which lever is adjustably fastened by screws 106 and in a channel formed at its inner end, a bent plate 107 depending Within the latch ring and needles when said lever is in one position. A. limit screw 104 in a lug on one side of said lever, bearing against latch ring 550 determines this operative position of said lever 105. Said plate 107 constitutes an internal memher to receive and guide the yarn and for this purpose is provided with a yarn slot 108, and has a projection at its lower end constituting an anvil 109. Mounted to slide on the face of the plate 107 by means of screw 116, taking in slot d of plate 107 and spring-box e surrounding said. screw, a cutting and clamp blade 110 is provided, which blade 110 is pivoted at its upper end to an operating lever 117 also pivoted on said stud 554.

A relatively light spring a is hooked into holes in levers 105 and 117, the stress of said spring normally holding the blade 110 up in theposition shown in Fig. 1, with respect to the plate 107, the anvil 109, and the yarn receiving slot 108.

Movement of the lever 105 about the stud 554 as a center, to elevate and remove the plate 107 from its adjusted position shown in Fig. 1 is thus permitted without disturbing the relation of levers 117 and 105.

In order to operate the cutting blade 110, lever 117 is actuated against the stress of spring a. I

The machine in my said application comprises a lever arm 473 pivoted on a stud 472, fast in standard 401, said lever serving to actua te thedevices for closing the yarn feeding gap inlatch ring 550. Stud 472 is extended to provide a pivot outside of the hub of lever 473 for an actuator member made as a three arm lever 100 having a short arm 101 under the influence of a relatively stronger spring 6, hooked into an adjustment screw 102 carried by a bracket 103 on the bed I). Said lever .100 has one arm 122 terminating the web-holder bed 295 and into the path of cams 124 adjustably held by screws it in a concentric slot on the under face pf said web-holder bed. The third arm 125 of said lever terminates in a flat behind lever 473 and in the plane of and near the depending end of level 117. The oint of contact between levers 100 and 11 is near the axis of latch ring pivot 552. I

Said end of lever 117 is bored, threaded, and split for a limit screw 118, locked in place by a pinch screw 119.

Adjustment at screw 118 determines a limit for the movement of lever 100 to prevent arm 122 from striking the .under side of web-holder bed 295 when arm 122 of lever 100 runs ofi' the end of earn 124. Lever 100 ass-eases about its pivot 472 out of'the range of the cams 124. This is brought about by an im pulse transmitted to the lever 100 through. the screw 118, the. lever 117 and the cutter blade 4.3.0 from the positively moved lever 105 and its attachment 107.

In order to position and cause the operatlon of the cutter and clamp 107, 110, etc., a substantiallyvertical tension bar 27 guided in a slot in-a comb-451 attached to stud 450 is provided. The upper end of said bar 27 is adjustably pivoted on a shoulder bolt 28 locked in a concentric slot 29 of the lever 105, the lower end of said bar 27 terminating outside of and beneath the open end of drum 120, an anti-friction roll 35 projectin within the open end of said drum 120.

ring of cams 36 on the inner periphery of the drum holds the bar 27 normally depressed, against the stress of a spring 0 hooked in a hole in said bar and into said screw 102.

Said cams serve to lift the cutter and clamp 107, 110, etc., out of its working position and hold the lever out of operative contact with its cams 124 at times coordinated with the other operations controlled by drum'120. Bar 27 is free to rock incomb 451 to permit the latch ring to be lifted about pivot As shown in Fig. 1 gaps are provided in, the cam 36 to permit lever to be operatively positioned, to then cause the actuation of blade at each passage of a cam 124.

The arrangement as shown in Fig. 1 is for cooperation with a sectional splicing yarn entering and leaving the needles substantially at opposite sides of the tube. purpose but one cam124 need be provided, to permit the blade 110 to be lifted to un-- cover the yarn receiving slot 108 prior to the exit of the yarn carried by the yarn guide F following the actuation of the thrust bar 460 for said guide by lug s and cam 296.

My device is also capable of cooperating with a plurality of yarns consecutively during each revolution; for instance with yarns which would otherwise be floated across the needle cylinder upon the actuation of a pair of the yarn guides F by the rocker levers 732, 733 for making a split tubular struc- For this ture, as explained in my said application Sebe suitably changed to position and remove the yarn cutter and clamp for this purpose; but for the usual purpose of knitting a splitsubstantially horizontal direction,

foot the arrangement shown in Fig. 1 is suitable without change, the 0 eratlon of the machine for making the split tubular structure requiring no more than the addition of a cam 124: at another point on the under side of the web-holder bed 295. Such a cam will not be detrimental to the operation of the device in connection with a splicing yarn, usually occupying the same segment with respect to the needles as one component of the split-foot, the additional cam 124 merely resulting in operating the cutter idly at the point where the splicing yarn is entered, without any effect except unnecessarily releasing the cut end of the splicing yarn clamped at the previous course, which end would ordinarily merely be pulled from itllie clamp formed by plate 107 and blade When knitting split-foot especially the blade 110 should not be operated to release the cut and held end of the incoming yarn previous to its safe entry at the needles, but the yarn slot 108 should be uncovered to receive the outgoing yarn before said yarn reaches the location of the cutter and clamp. It will be seen that the dimensions of the cams 124.- determine accurately the time elapsing between opening the clamp and the cutting stroke given by blade 110 when said cam 124 has passed.

The use of my device enables the ordinary knitting yarns and yarn changes for a large number of operations to be provided for as usual by the clamp 606 and cutter 608, such of the yarn guides as are employed for the rapid changes for splicing or split-foot knitting cooperating with the cutter and clamp 107, 110 when in use for these special purposes, the arrangement ermitting the same guides and yarns, if desired, to be used at other parts of the operation in connection with the cutter 608 and clamp 606, operated from the pattern surface of drum 120 at relatively infrequent intervals.

' It should be noticed that the rapid strokes given blade 110 involve movement of small and light parts comprising levers 100 and 117 only, and that the hammer blow by actuator 100 is delivered substantially at and in the plane of latch ring pivot 552, and in a whereby disturbance of the latch ring and its attachments is prevented, and that lever 100 is prevented from striking a sudden vertical blow at the needle cylinder likely to disturb the relative positions of needles or webholders. I

y The connection for positioning and operating the severing and clamping means effects the removal of the device and idling of lever 100 positively through tension rod '27, and permits the cutting stroke of blade 110 to be given by spring I) in opposition to spring a, thereby permitting a delicate adand the pattern connection for positionjustment at screw 102 of the power of the cutting stroke.

When the latch ring is elevated about pivot 552, bar 27 is free to move in comb 451 to permit pivot bolt 28 to sweep through the necessary are, roller 35 moving downwardly away from its cam 36 at this time. This arrangement avoids providing a breakable connection between the severing device ing it.

What I claim is:

1. A knitting machine having means'for feedin and Withdrawing a plurality of yarns in combination with common means for severing each yarn when withdrawn, and means for actuating said severing device when yarnchangin at comparatively long intervals, and anot er severing device adapted to sever said yarns successively when said yarns are Withdrawn at frequent intervals.

2. A knitting machine having means for feeding and withdrawing a plurality of yarns in succession for yarn changing, and common means for severing and clamping said yarns when Withdrawn, in combination with other additional means-for withdrawing and severing each of a plurality of said yarns in succession during each course knit.

3. A knitting machine having means for feeding and withdrawing a plurality of yarns during each course knit, in combination with a single severing means adapted to independently sever each yarn when withdrawn.

4. A knitting machine having means for feeding and withdrawing a plurality of yarns during each course knit, in combination with a single severing device adapted to sever each yarn when withdrawn, and means for actuating said severing device whenever one of said yarns is withdrawn.

5. A knitting machine having means for feeding and withdrawing a plurality of yarns during each course knit, in combination with single means adapted to independently sever and clamp each yarn when withdrawn and for releasing the clamped yarn prior to severing another yarn.

6. A knitting machine having means for feeding and withdrawing a plurality of yarns during each course knit, in combination with means for severing and clamping each yarn when withdrawn, and means for actuating said severing and clamping device whenever one of said yarns is withdrawn to first release one yarn and then sever and clamp another yarn.

7. A knitting machine having in combination yarn guides and means for actuating a plurality of said yarn guide a plurality of times during each course knit, a cutter and clamp device for yarns removed from work by said frequently actuated yarn guides, and means for actuating said cutter and clamp device whenever any of said yarn guides is actuated.

- 8. A knitting machine having in combination yarn guides, means to operate. said yarn guides for yarn-changing, and a severmg and clamping device for severing yarns removed from work thereby, means adapted to actuate two or more of said .yarn guides during certain times only at relatively frequent intervals, severing and clamping means, and operating means therefor active at said times only for severing and holding the yarn thrown out of work by one or more of said frequently actuated yarn guides.w

9. A knitting machine having in combination needles and a series of instruments mounted for like .movement into and out of operative relation to said needles includingya'rn guidesand a yarn severing device, a

pattern surface, and a series of direct connections between said pattern surface and said instruments for independently and coordinately determining their operative and tions.

11. A knitting machine having'in combination a latch ring, a series of pivoted yarn guides, means for rendering said yarn guides-lnoperatlve by elevatmg movements .about their pivot, a yarn severing and clamping mechanism mounted on said pivot, and means for movlng sald yarn severing Y and clamping mechanism about said pivot into and out of operative position.

12. A knitting machine having in combination a needle cylinder, a pivoted actuating member, and means relatively. fixed with respect to said needle cylinder for moving said actuating member, a guard member movably mounted in relation to said cylinder, and having thereon a series of yarn guides, a yarn severing and clamping de- ,vlce, and an" operating lever for said yarn severing device having one end in free contact with said actuating member when said guard member is operatively positioned.

13. A knitting machine havin in combination a needle cylinder, a stan ard, and a latch ring pivoted on said standard, an actuating member pivoted on said standard, and means relatively fixed with respect to said needle cylinder for moving said actuating member, a series of yarn guides pivoted on said latch ring, a yarn severing and clamping device-pivoted on said latch ring, and

an operating lever for said yarn severing device having one-end in free contact with said actuating member.

14. A knitting machine" having in'combination a rotary needle cylinder, a'standard, and a latch ring ivoted on said standard,

an actuating mem er pivoted on said standmovement with respect to said latchring,

and an operating lever for said yarn severv ing device, said severing and clamping device and said operating lever being pivoted coaxially with said yarn guides on said latch rmg, an actuating member for said operating lever, andmeans for operating said actuating member.

16. In a knitting machine, a pivoted latchring, a yarn-manipulating device on said latch-ring for operation at short intervals comprising .an operating member terminating near the latch-ring pivot, and actuating means therefor comprising a lever pivoted on a fixed part having an arm for free contact with said operating member to move it in an are near the pivoted center of said latch ring.

17. A- knitting machine having in combination a pivoted latch ring, a yarn manipulating device movably mounted on said latch ring, and means for positioning said device comprising a pattern surface and a bar pivoted to said device and free to move with said latch ring away from said pattern surface when said ring is elevated aboutits pivot. a

18. A yarn severing device for a knitting machine comprising in combination a positioning lever and an operating lever respectively carrying a yarn guide member and a. severing blade, a' spring reacting between said levers to hold the severing device open to receive the yarn, a patte n controlled continuous connection to sai positioning lever for positively moving the same to'an inoperative position, spring means normally holding said lever in its operative position, and an actuator for moving said operating lever.- 19. A yarn severing device for a knitting machine comprising in combination a positioning lever and an operating lever respectively carrying for cooperation a yarn guide member and a severing blade, a spring reacting between said levers to hold the severing device open to receive the yarn, a pattern In testimony whereof, I have signed my controlled connection to said positioning name to this specification in the presence of 10 lever for positively moving the same to pin two subscribing witnesses. inoperative osition, spring means. norma 5 holdingsairf positioning lever in its opera? 7 ROBERT SCOTT tive position, an actuator and an adjustable Witnesses: spring and retracting means therefor for RUTH A. Roman, moving said operating lever. HEIEN M. SWEENEY. 

